Your physics simulations are so impressive . I downloaded EJS and tried to play with it. I have already seen you flash tutorial. However, could you give me some suggestions - where and how can I get some books or web tutorials to learn EJS? I just feel that it would take me longer time to play with this software and understand it without reading a book or a help manual.

The quantitative expression for the effect of these three variables on electric force is known as Coulomb's law. Coulomb's law states that the electrical force between two charged objects is directly proportional to the product of the quantity of charge on the objects and inversely proportional to the square of the separation distance between the two objects.